Ttjbjt-tabib ob swivel



P10, 'uNGe-mj b TURN TABLE 0R s-wlvEL. ABPLlcATloN 'mgu nov. 21, 1-918."

1,321,497". l Patentamw 11,1919.

. @M @m @my nrnnir OFFICE.

FAUT.; @TTU UNGER, F OAK PARK, ILLINOIS.

frunnarrisnn on swrvnit.

Specification of Letters ltatent.

ratentea nov. it, tais.

.application filed November 221, 19m. Serial No. 263,418?.`

To all ywhom t may concern Be it known that l, PAUL @Tiro Unenn, a

citizen of the United States, residing in the' village of (lak llark, in the county of Cook and State of illinois, have invented certain new and useful lnrpu'ovements in Turnrlables or Swivels, of which the following is a specification.

My invention relates to turntable or swivel devices as used for instance as at-` ln the accompanying drawings, `which form a partv of vthis specification, I have illustrated these improvements ina highly advantageous form as anA attachment for milling machines and theiike.` lin these drawings Figure 1 is a bottoni view of the device; Fig. 2 is a medial section as on line 2-2 of Fig. l; Fig. 3 is a fragmentary section on the line l- 3 of Fig. 1; and Fig. i is lio l'itl a fragmentary section on the line fidi of Fig. l. y i ttachments of this class are applied to the bed plates of milling machines, etc., for holding thereon some object which it is desired to turn or move on the axis'of the turntable.

or it may be a vise adapted 4to hold the work. rlhe object in turning the work from .time to time is to provide new surfaces for attack by the cutter of the machine, as is well understood in the art. 4

-The device illustrated comprises first a base which has an annular rim 11 nicely surfaced at its bottom 12 so as to rest ac curately upon the bed plate. Two projecting blocks 13 areset into recessesdiametrically opposite to each other in the base and are held rigidly by screws 14. yllhese blocks serve as guides for 'positioning the device and are adapted to enter a slot in the bed plate in the usual way. The base 10 is held positively upon the bed plate by bolts in the recesses 15 in the ears 16 integral with the base.

lsurface 2O with the lathe tool.

Such an object may be the work itself secured directly upon the turntable,

slanting or wedging surface shown at 20, which 1s formed so as to be oli-circular lines in planes parallel with the base surface 12,

as, for instance, by turning boththe surfaces12 and 2O while the base 10 is carried on a mandrel in a lathe, or by first planing the surface 12, then securing it against the face plate of a lathe, and then cutting the The 'outer annular surface 24 of the base 10 is preferably also turned true upon the axis of the surface 20. The base 10 in my practice is of cast iron. i.

'lhe turntable illustrated is also an iron casting, and of the diameter ofthe base 10 l and having its outer surface 26 substantially a continuation of the out-er surface 2t of the base. A simple scale in degrees and ininutes and 'a pointer, or a vernici' scale, may be marked onv the annular surfaces 2% and 26 to enable the workman to adjust the table accurately to the desired amount of rotation from time to time. Such a scale is not shownbut is well known in connection with devices of this class.`

The table has also an annular beveled or wedging surface, shown at 28, formed to coact with the surface 20 in supporting and tighteneing the table upon the base. -The table always rests upon these bearing and interwedging or locking surfaces.

'll-he object to be held, such as the work or vise, rests upon the top surface 29 of the table, and these surfaces 28 and v29 are accurately truedto each other, as in the way or ways pointed out lfor truing the surfaces 12 and 20. lWhen the table is operatively resting upon the base, as shown in Fig. 2,

the surfaces 12 and 20 are'in parallel planes in all positions of rotative adjustment of the table.

. The table has four diametric T-grooves or bolt-holding recesses 30, well known in the art, for holding the heads and shanks of bolts for tightening the work or vise upon the table.

The means illustrated for tightening or locking the table upon the base and for ren leasing these parts for relative movement comprise a system of links and levers, with pressure adjusting means, all so formed and arranged that by simply moving an operatn ing lever in one direction or the other the result is obtained.

More specifically, l provide a centrally arranged pulling member or link in the v ,i to accommodate the nut 34 so that 1t willl form v.of a rod' 32 screw-threaded at 33 and v. In the other end portion of the pull rod there provided with the pressure-adjusting -1 nut 34. This nut is' of the half-split type and has the locking .screws threaded in one of its bifurcations and impinging against the other. By retracting the screw 35 the nut 34 may be turned, and upon advancing the screw the nut becomes locked upon the "threads at 33. v

The table is centrally recessed as shown,

lie flush with or beneath the bottom surfaces lof the-T slots 30which intersect or meet at thuat place. To" admit of such recessing while maintaining desirable lightness with suitable strengththe central bottom portion of the table is provided with the boss or eX- tension 35 spaced from but'encompassed by the adjacent central recess lin the base formed by the lowered wall 19. The table and base are bored @entrally for the rod 32.

. lheld 1n place by the stem 21 which may be riveted to the wall' 18. The lever 38 is i preferably materially wide where it engages the fulcrum pinV 37 and the pivot 22 for purposesof strength as Well as to provide a well balanced pull upon the central rod 32.

The outer end of the lever 38 is milled to provide two recesses 39 for the accommodation of the two links 40, and a cross pin 41 holds these twov links p'ivotally in position. Upon these two links 40 at their upper end is pivotally mounted the operating lever 42 by means of the pin 43'. The lever 42 is formed with an upstanding end making it substantially a-'bell-crank, and this end portion ismilled to provide slots for receiving the links 40. This end portion is tapered upward forming substantially a knife-edge pivot at 44 which is materially wide and strong and which engages a notch l45 in the wall 1-8` of the base. lA hand rod 46 is insertible loosely 'in a recess in the end of the lever 42 for moving its free end up and downto tighten 'and release the table. A suitable opening is provided in the base for the lever 42.-

InlI Fig. `2 the lever parts are shown in their table-locking position. It is to be noticed'that in this position the pivotl 43 is slightly beyond and toward the left of a right line drawnfrom the notch' 45 to the lpivot"41. The parts are therefore locked tightly in that position` for the pivot 43 is sllghtly beyond the dead center line of these three pivotal points. Upon raising the handle 46 the pivot 43 is moved to the pin 32 and consequently releasing the table from its tight engagement at the wedging surfaces 20 and 28. The table may thereupon be moved axially as desired.

The links 40 are two in number and arranged as shown and described principally for purposes of a well balanced construction. They constitute in effect only one link, and this link 40 forms with the lever 42 and the pivot 41 a toggle connection, the knuckle joint of which is the pivot 43. In practice this knuckle joint should pass but slightly beyond the dead center line described-just sufficiently to lock the parts. A stop arranged as desired may be provided to limit this locking movement. I provide an adjustingscrew 48 for this purpose. Adjustment by the screw 48 willrarely if ever be required after the initial one. By means of the adjusting nut 34 the desired pressure for binding the table and base frictionally together is obtained. Upon lifting the lever 42 the handle 46 may be withdrawn and inserted-in one of the recesses 50 for swinging the table around as desired. j

By means of the coacting slantiiw surfaces at 20 and 28 the table is mounted:7 upon the base for accurate rotation, and upon its being clamped down by means of the lever 38 and associated parts it automatically adjusts itself centrally with the desired precision. T e invention is not limited inthis regard to such slanting surfaces or to any slanting or wedging surfaces; but such or equivalent surfaces are peculiarly valuable in providing the self-adjusting feature mentioned'as well as in coperating with each other to produce a strong frictional engagement one with'the other. These interengaging binding surfaces are preferably close to the outer margins of the base and table so as to provide a relatively wide seat in diametric directions and to increase the area of the binding surfaces over what they would be with shorter radii.l

The construction illustrated is further advantageous in that these surfaces 20 and 28 are always maintained free from dust, chips, etc., and are self cleansing of excess of lubricating oil or foreignmatter in the oil.

The invention is not limited to the particular system of links and levers shown, as, in viewof this disclosure, persons skilled in the art will readily be able to provide variations of and modifications therefrom, without departing from the spirit of the invention set forth. The several parts not including the base and table are preferably Aif) titl

Leonie? made of steel. 'llhe drawings are substantially true to scale.

l claim:

l. ln a device of the character described, the combination of a base, a turntable movably mounted on the base, and unitary hands operable lever means for drawing the turntable bodily toward and upon the base for binding the two frictionally together.

2. ln a. device of the character described, the combination of a base, a turntable mounted for rotation on the base, and unitary hand-operable lever means for drawing the turntable bodily toward and upon the base for binding the tvvo frictionally together.

3. ln a device of the character described, the combination of a base, a turntable mounted for rotation on the base, and. lever means including a toggle for drawing the turntable bodily toward and upon the base for binding the tvvo frictionally together.

4:. ln a device of the character described, the combination of a base, a turntable mounted for rotation on the base, and means including a toggle for locking the turntable and base together.

5. lln a device of the character described, the combination of a base having a friction surface thereon, a turntable having a coperating friction surface thereon, said turn# table being mounted for rotation on the base with said friction surfaces facing each other, and unitary hand-operable lever means for clamping said friction surfaces tightly upon each other and for automatically locking said turntable upon the base in clamped relation.

6. ln a device of the character described, the combination of a base having a friction surface thereon, a turntable having a coperating friction surface thereon, said turntable being iuonnted for rotation on the base ivith said friction surfaces facing each other, and lever4 means including a toggle for clamping said friction surfaces tightly upon vcach other.

7. ln a device of the characterdescribed, y

means for moving the knuckle joint of said toggle.

8. ln a device of thc charac 'er described, the combination of a base having a friction surface thereon, a turntable having a coperating friction surface thereon, said turntable being mounted for rotation on the base with said friction surfaces facing each other, a lever of the first class pivoted at one end upon thebasc and intermediate its ends pivotally connected to said turntable., a link pivotally connected to the'other end of said lcver of the first class, a lever: pivotally connected intermediate its ends to said link, said second lever having one end pivoted upon said base, and means formoving the free end of said second lever.

9. In'l a device of thecharacter described, the combination of a base having an annular friction surface thereon, av turntable mounted for rotation on said base and having an annular friction surface closely adj acent to and facing said other' friction sur face, a lever carried by the base,-a connection operatively between said lever and the central portion of said turntable, and means for moving said lever to bind said friction surfaces tightly together,

10. In a device of the character described, the combination of a base having an annular friction surface thereon, a turntable .mounted for rotation on said base and having lan annular friction sur :ace closely adjacent to and facing said other friction surface, and lever means and link means including a toggle carried by the base and operatively connected centrally of the turntable for binding said friction surfaces tightly together'. l

11. ln a device of thecharacter described, the combination of a base having an annular slanting Wedging surface thereon, a turntable having an annular slanting Wedging surface fitting'said other surface and resting thereon, whereby the table may romeans for clamping said Surfaces tightly together.

12. In a device of the character' described, the combination of a base having an annular slanting ivedging surface thereon, a turntable having an annular slanting wedging surface fitting said othersurface and resting thereon, whereby the table may rotate upon the base upon said surfaces as a bear ing, and means including a lever connected centrally of the turntable for clamping said surfaces tightly together.

13. lln a device of the character described, the combination of a base having an annular slanting Wedging surface thereon, a turntable having an annular slanting Wedging surface fitting said other surface and rest. ing thereon, `whereby the table may rotate upon the base upon said surfaces as a bearing, and lever means including a toggle carried by the base and connected centrally of the turntable for clamping saidv surfaces tightly together.`

14. In a device of the character described,

mounted for rotationfon the base, unitary y means including a pressure-exerting toggle for binding lthetvvo k:trictionally together, andf'means'z'for adjusting the binding presthe combinationof a baseyhaving'an annular slantmg'wedglng' surface thereon, a turn` `vtablefhavingjan annular `slanting Wedging surfacev ittlngsald other 'suriace' and resting thereon, v,wherebyv the table may rotate ...upon the base upon saidsurfaces asa bearingga lever pivot'ed upon'the base and piv- "ot'ally connected-to said turntable centrallyl thereoia ytoggle connected to said lever at vlone end of the toggle, the other end of the toggle being pivoted upon a relatively iXed part carried by the base, and means for moving theknuckle joint of said toggle.. f `15;l In a device of the character described, 'the lcombinationjofA al base, a turntable mounted forrtation thereon, and unitary hand operable', quick acting, self l. locking toward'and'upon'the base forbinding the .two .frictionally together,` and means for adjustably increasing and decreasing the binding force of'said lever means." j

17. .In adeviceofthe character described, theJcombination' of a base, a turntable mounted for rotation .on the base, unitary 'lever means including apressure exerting `'toggle 'for drawing the turntable bodily toward and upon the'base for binding the tvvo the movement ofthe knucklejoint of the rictionally together, and a stop for limiting I i* toggle to a position thereofslightly beyond its dead center inA its rtighteningmovement.

" 18.` In a-device of the character described,

thekfcombination of a. base,A a. turntable .sure exerted by saidtoggle. v

19. In a device off-the characterdescribed,

-l the combination of 'a base, a turntable mounted for. .rotation on the base, lever V means for drawing the turntable andbase vclampi'ngly.together, and means foradjusting the pressure of said clamping means.

'tive length, and lever means comiected to said pulling member and carried by the base for drawing the table and base frictionally together.

21. In a device of the character described, thel combination of a base, a work-holding table movably mounted on the base, handoperable means for drawing the turntable bodily toward and upon the base for clamping the two frictionally together, and means for automatically locking the base and table in their clamped relation.

22. In a deviceof the character described, the combination of a base having a substan tially central opening therethrough, a tuin table movably mounted on the base, said turntable carrying a pulling member extending through the opening of the base, means beneath .the turntable and operatively conv nected with said pulling member for exerting pulling strains upon said member to bind the table rictionally upon the base.

- 23. In a device of the character described,

the .combination of a base having a substantially central openin therethrough, a turntable mounted on theg'base, avpulling member carried by the turntable and. projecting through the opening in the base, a lever en'- gaging said pulling `member intermediate the ends ofthe lever, said lever being fulcrumed at one end operatively upon Said base, the other end ofsaid lever pivotally carryinof a link, a second lever mounted upon said linIi, said second lever being in engagement With-the "base, the place of such engagement and the connections of the two levers With said link being in a straight line When the table is clamped upon the base, said second` lever being hand-operable to throw said three connections out of alinement and thereby release the table, and means for adjusting the effective length of the connection between the table and said first mentioned lever.

PAUL oT'ro UNGER. 

